I have an older cordless house phone that doesn't keep a charge anymore. I also have a few receiver packs from converted nitros. Sooooo, a little modification to the phone battery area and a removing 2 of the 5 cells of an Rx pack, and I now have a new phone battery!
It's not perfect, but it works. The Rx pack cells are exactly the same length, but are about 2mm larger in diameter. But that's nothing a little dremel work to the phone battery tray won't fix. And now I have a phone with almost triple the runtime as stock. NiMH pack = 1100mAh, Stock phone pack = 400mAh.
Unfortunately, 6 out of the 10 keypad numbers don't light up anymore, but that's just acceptable collateral damage IMO. Once the [ex]wife moves out, I'll be canceling the land line anyway, but this will work until then...
Can you tell I was bored?